They capture and store in their cells a great variety of insects, spiders, flies and plant-lice. Certain members of this group of insects burrow into the earth and conceal their nests by inserting a stone over which they scrape earth. When the prey is taken the insect is carried into the burrow and the entrance to it is again closed. Dr. S. W. Williston, writing of this insect, states that the wasp has been observed to "use a stone as a tamping-iron to pack the earth into the mouth of the burrow." He feared, he says, to publish this observation because he thought he would not be believed. It is also said by observers of these wasps that each insect seems to have distinct individuality, for instance, some are careless, some are industrious, some scrupulously painstaking. One entomologist tells of a method used by a wasp in capturing a certain spider: the wasp would entangle itself in the spider's web and the latter would dart out from her hiding place; the wasp would then easily disengage herself from the web and follow the spider to its hiding place. The Cicada often becomes prey of the wasp and its song suddenly ceases as it is quickly stung into insensibility. If in a struggle the two fall to the ground, the wasp drags the Cicada up a tree until she reaches a height from which she can fly downward to her storehouse. The colony wasps are the paper-making insects, their nests being made from woodpulp and woodfiber secured from old fences and unpainted woodwork which they mix with saliva and form into a pulp with which they build their nests. [Illustration: CICADA.] [Illustration: COLONY NEST OF BLACK ANTS] [Illustration: FEEDING LARVAE] [Illustration: CELLS OF BLACK ANTS. ENLARGED.] ANTS. The third group in this important order are the ants. They always live in communities and build nests which are especially devoted to the purpose of raising their young. The young are fed from the mouth of the worker ants. A remarkable peculiarity of these insects is their practice of making slaves. The large red ant often makes raids on other ants, carrying off their young to their own nests where they are brought up to perform the work of their masters. They also domesticate plant-lice, which have on that account been nicknamed "Ant-Cows." Instances are related where beetles have been found in ant nests; they are fed by the ants and in case of migration are carried away by them to their new home. While some of these guests are tolerated because, perhaps, the ants cannot rid themselves of them and others are parasites, some seem to be of the nature of pets. The black ants build mountain-like nests, sometimes reaching three feet in height; in these nests sometimes forty or fifty species of ants have been found. GALL FLIES.